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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29b5a0e9090bb1de29852e248683d08420f16ef0c5f4bba8fdb60922d0f7804e' 
  AND token = '+gui/uart4PdUWRFmSPk97peSQmeP+JIHAK27mmL26c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}